Revert of Don't handle NaturalScroll in Chrome but pass it to CMT instead

ui/events/event_utils.h

Index: ui/events/event_utils.h
diff --git a/ui/events/event_utils.h b/ui/events/event_utils.h
index 9c40ab5fa943386e9b5d550f59b3a2fc1628a052..e0775225f8245d6e810c4fb0283920fc9abed3bc 100644
--- a/ui/events/event_utils.h
+++ b/ui/events/event_utils.h
@@ -123,6 +123,12 @@
                                double* start_time,
                                double* end_time);
 
+// Enable/disable natural scrolling for touchpads.
+EVENTS_EXPORT void SetNaturalScroll(bool enabled);
+
+// In natural scrolling enabled for touchpads?
+EVENTS_EXPORT bool IsNaturalScrollEnabled();
+
 // Returns whether natural scrolling should be used for touchpad.
 EVENTS_EXPORT bool ShouldDefaultToNaturalScroll();